Technique for enabling emergency call callback of a terminal without a valid subscriber identity

US6571092B2 · kind B2 · utility

Assignee

• Nokia Networks Oy · FI

Inventors

• Stefano Faccin · Hayward, US
• Jakko Rajaniemi · Helsinki, FI

Key dates

• Filing date: Feb 15, 2001
• Grant date: May 27, 2003
• Expiry date: Feb 15, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W76/50
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

A technique for enabling a callback by a called party, such as an emergency center, of a terminal, such as a mobile terminal having no identity and no CBN (Call Back Number), in the case of an emergency call, for example, includes allocating a temporary identity to the terminal and then allocating an IP address to the terminal and storing the association between the temporary identity and the allocated IP address. A CBN is that allocated to the mobile terminal and the association between the CBN and the allocated IP address is also stored. A call is then setup between the terminal and the called party. Upon the call between the terminal and the called party being dropped, the IP address associated with the allocated CBN of the terminal is retrieved as is the stored temporary identity corresponding to the retrieved IP address. Paging is then forwarded to the terminal using the stored temporary identity and a call is again setup between the terminal and the called party.